How can White save himself?

Servietsky's line is wrong. After Qd5 the line is Qxd5 Nxd5 Nd7+ Kc8 Nb6++ Kb8 Nxa8 Kxa8 and white is up in material.

@ mattattack99 - your puzzle appears to have no relationship with the Valejjo - Svidler game in post in #2.
You perhaps derived it somehow, but it's hard to guess how, since in your "version" black did not castle but slowly moved to a queenside, and in the game black castled kingside on move 7.
Servietsky's line is wrong. After Qd5 the line is Qxd5 Nxd5 Nd7+ Kc8 Nb6++ Kb8 Nxa8 Kxa8 and white is up in material.

@ mattattack99 - your puzzle appears to have no relationship with the Valejjo - Svidler game in post in #2.
You perhaps derived it somehow, but it's hard to guess how, since in your "version" black did not castle but slowly moved to a queenside, and in the game black castled kingside on move 7.
On move 18, I looked at Nxh7, instead of the game's Nxf7. My analysis led to the black king running toward the queenside. That's how I reached the diagrammed position.

Servietsky- On your line (comment 12) you gave 5. Nxa8. White would play Nxd5, and with 2 pieces for a rook and a far advanced passed pawn on h5, white would be winning.